142 



Flora of the Malayan Peninsula. 



A. nutans var. 



verticillata. 



A. Tappii. 



A. memh-anaceum. 



Leaves la a paeudo- whorl at the base of the stem ... 6. 



Leaves nnmeroa3 scattered along the whole-length 

 of the stem : — 



Leaves glabrous : — 



Leaves thickly membranous, narrowly elliptic, 

 acute at the base ... ... ... 4. 



Leaves thinly membranous, broadly ovate, the 

 base widely cordate ... ..• ... 5. 



Leaves more or less pubescent : — 

 Cymes dense, many-flowered : — 

 Leaves oblong-elliptic, oblong, or elliptic, sub- 

 acute, flowers drooping in bud ... ... 6. A, nutans. 



Leaves broadly oblanceolate, shortly acumin- 

 ate ; flowers erect in bud ... ... 7. A. urticifolium. 



Cymes lax, few-flowered ... ... 8. A, Ridleyi. 



Leaves of the pairs very unequal, the smaller one minute 

 and about equal to the stipules : — 



Leaves a single pair at the apex of the stem : — 

 Corolla with narrow buds, its lobes lanceolate ; 

 anthers with apical appendages longer than them- 

 selves, the filaments thick ; leaves with 5 or 6 pairs 

 of main-nerves ... ... ... ... 9. A. unifolium. 



Corolla ovate in bud ; its lobes boldly nerved, 

 ovate; anthers sessile, their apical appendages 



short: leaves with 9 to 14 pairs of main-nerves ... 10. A, unifolioloide. 

 Leaves several pairs crowded near the apex of the 

 (often short) stem, pubescent; flowers '35 to '4 in. 

 long, glabrous : calyx-lobes short, acute ; calyx and 

 corolla glabrous ... 



Leaves scattered along the whole length of the stem : — 

 Leaves more or less pubescent on both surfaces, 

 the lower not glaucous: calyx hairy and corolla 

 glabrous externally 

 Leaves pubescent on both surfaces ; or if glabres- 

 cent (var.) the midrib, nerves and edges with a " 

 few short, thick hairs; calyx and corolla pubes- 

 cent externally ... ... ... ... 13. A. involucratum. 



Leaves quite glabrons, succulent ; — 



Leaves linear-oblong ; main-nerves obscure ... 14. A. Curtisii, 



Leaves elliptic- or oblanceolate-oblong ; with 7 to 



12 pairs of main-nerves ... ... ... 15. A. subcrassum. 



Leaves glabrous on both surfaces, occasionally with 

 a few adpressed hairs, not glaucous beneath : — 

 Leaves thinly membranous, broadly oblanceolate, 

 flowers in terminal umbels ... ... 16. A. peralcense. 



Leaves thickly membranous :— 



Leaves with broad, obliquely pseudo-cordate 



bases ... ... ... ... 17. A, ollongum. 



32 



11. A. spimilosum. 



12. A, Elatostemma. 



